TL* THE CONTACT OWNS A 2001 HYUNDAI SANTA FE. WHILE DRIVING UPHILL AT AN UNKNOWN SPEED, THE VEHICLE BEGAN TO SHUTTER AND FAILED TO ACCELERATE. THE CONTACT WAS ALERTED THAT THE SUBFRAME WAS ON FIRE. THE CONTACT IMMEDIATELY SHUT OFF THE ENGINE AND EXITED THE VEHICLE. AN ONLOOKER ASSISTED WITH EXTINGUISHING THE FIRE WITH WATER. THE FIRE WAS EXTINGUISHED BY THE TIME THE FIREFIGHTERS ARRIVED. NEITHER THE FIRE DEPARTMENT INVESTIGATOR NOR THE INSURANCE INVESTIGATOR WERE ABLE TO IDENTIFY THE CAUSE OF THE FAILURE. THE DEALER AND MANUFACTURER WERE NOT NOTIFIED. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS UNKNOWN.